Tape measure clip for improving measurement accuracy

ABSTRACT

Provided is a caliper extender ( 100 ), which fits over a tape measure blade ( 124 ), enabling accurate measurements to be taken of an inside dimension ( 142 ). Extender ( 100 ) slides along blade ( 124 ) and is positioned against one wall of the inside dimension ( 142 ). Blade ( 124 ) is then repositioned flat against extender ( 100 ) and a measurement reading is taken. A pointer ( 110 ) may also be incorporated into extender ( 100 ) to indicate a tape marking ( 202, 204, 206, 208  or  210 ) corresponding to an accurate measurement. In the alternative, a caliper extender ( 160 ) is incorporated into a tape measure ( 350 ) such that extender ( 160 ) can be disengaged from a casing ( 352 ) of tape measure ( 350 ), slid along a blade ( 190 ) and a measurement reading taken through a window ( 308 ) in a channel ( 304 ) through which blade ( 190 ) is installed.

TECHNICAL FIELD OF THE DISCLOSURE

This disclosure pertains generally to a tape measure and relatedattachment and, more specifically, to a tape measure with a clip thatimproves the accuracy of the tape measure.

BACKGROUND OF THE DISCLOSURE

A tape measure is a common tool in many households and carpenters' toolbelts. The typical tape measure consists of a metal tape, or “blade,”with inscribed or printed markings, beginning at ‘0’ at a “hook” end,and extending the length of the blade, each mark designating thecorresponding distance from the hook end in either metric or Englishmeasurements. The end opposite the hook end will be referred to as the“measurement” end. At the hook end is an metal angle that both bluntsthe sharp edge of the blade and can be positioned around the edge of anobject to be measured, thus holding the tape measure in place during ameasurement operation.

Often, the blade is wound into a metal or plastic casing, measurementend first, from which the blade can be pulled. Such a casing not onlyfacilitates the use of the tape measure by keeping unnecessary lengthout of the way but also makes the tape measure more compact for storage.In addition, blades are typically spring-loaded so that they can beeasily retracted into the case when desired. A button on the caseengages and disengages a stop that is positioned against the blade sothat the blade is not inadvertently extended or retracted at aninappropriate time.

Achieving an accurate measurement with a tape measurement can sometimesbe a tricky proposition. The hook end is positioned around an object tobe measured, the blade is positioned over the object and a lengthcorresponding to the object is ascertained by reading the markingsinscribed or printed on the blade. This procedure is relativelystraightforward when the object to be measured is a stand-alone objectsuch as a length of wood. However, the procedure is more complex if themeasurement to be taken is an inside measurement, such as the inside ofa box. In this situation, the hook end is placed against one inside wallof the object and the blade is bent at the measurement end in an attemptto position the blade against the other inside wall. However, since theblade can not typically be bent into a ninety degree (90°) angle, a usermust estimate where the blade would fit against the inside wall if itcould be bent into such an angle. This estimation introduces an errorinto the procedure, even for the experienced user.

This disclosure describes a device that affixes onto the blade of a tapemeasure and serves to improve the accuracy of the tape measure byeliminating any uncertainty caused by the bending of the blade at themeasurement end. These and other advantages, as well as additionalinventive features, will be apparent from the present disclosure.

BRIEF DESCRIPTION OF THE FIGURES

For a more complete understanding of the present disclosure, and theadvantages thereof, reference is now made to the following briefdescriptions taken in conjunction with the accompanying figures, inwhich like reference numerals indicate like features.

FIG. 1 is an illustration of a caliper extender claimed herein.

FIG. 2 is an illustration of the caliper extender of FIG. 1 from adifferent perspective.

FIG. 3 is an illustration of the caliper extender of FIGS. 1 and 2 witha tape measure blade installed.

FIG. 4 illustrates a method of employing the caliper extender of FIGS.1–3 to accurately take an inside measurement.

FIG. 5 illustrates one method of taking a measurement reading with thecaliper extender of FIGS. 1–4.

FIG. 6 is alternative embodiment of the claimed subject matter.

FIG. 7 is a portion of a tape measure blade employed in conjunction withvarious embodiments of the claimed subject matter.

FIGS. 8–10 are alternative embodiments of the claimed subject matter.

FIG. 9 is an illustration of an alternative embodiment of the claimedcaliper extender that may be incorporated into a typical,retractable-type tape measure.

FIG. 11 is a side view of a tape measure, incorporating the caliperextender illustrated in FIG. 9.

FIG. 12 is a partial front view of the tape measure introduced in FIG.11.

FIG. 13 is a close-up of the front view of the tape measure introducedin described above in conjunction with FIGS. 11 and 12.

FIG. 14 is a bottom view of the tape measure introduced in FIG. 11.

DETAILED DESCRIPTION

This disclosure provides a [insert a brief description of the invention(e.g., a prose version of the independent claims)].

Other aspects, objectives and advantages of the invention will becomemore apparent from the remainder of the detailed description when takenin conjunction with the accompanying drawings.

FIG. 1 illustrates a caliper extender 100 constructed in accordance withthe claimed subject matter. Extender 100 includes an extender body 102that is, when caliper extender 100 is in use, positioned against a tapemeasure blade, such as a tape measure blade 124 (see FIGS. 2–5).

Attached to body 102 is a clip 104 that hooks around blade 124 to holdextender body 102 of extender 100 in position against blade 124.Extender body 102 is held against blade 124 with just enough force toenable extender 100 to slide along blade 124. An attachment clip 106 ispositioned across from clip 104 on extender body 102. Clips 104 and 106are described in more detail below in conjunction with FIG. 2 from aperspective A, shown in FIG. 1 by dotted lines.

Attachment clip 106 also holds extender body 102 against blade 124,applying enough force to position blade 124 and yet still enablingextender 100 to slide along blade 124. Attachment clip 106 is designedto be flexible enough to be pushed back, as indicated by arrow 108, toprovide enough room for blade 124 to be slipped under clip 104. Whenreleased, attachment clip 106 then returns to its original position,sliding over blade 124. Thus, clips 104 and 106 work together to holdextender body 102 against blade 124.

A measurement pointer 110 on clip 104 enables a user to accuratelydetermine a position on blade 124 for measurement purposes. The use ofpointer 110 is explained in more detail below in conjunction with FIGS.3–5.

An end extension 112 attaches to body 102 at an end 116 of caliperextender 100 opposite the end with clips 104 and 106. Extension 112 maycome in different configurations, enabling caliper extender 100 to takemeasurements of different types of objects. For example, extension 112has a protrusion 114 that is inserted into a hole (not shown) so that ameasurement that includes the depth of the hole can be taken. Many otherconfigurations of extensions are possible. For example, oneconfiguration may enable caliper extender 100 to take a measurement of acorner (see FIG. 8).

FIG. 2 is an illustration of caliper extender 100 from perspective A asshown in FIG. 1. Also shown are extender body 102, clip 104, attachmentclip 106 and pointer 110. Clip 104 extends perpendicularly from body 102and includes a cap portion 118 that holds a blade 124 against body 102at a point 122. Attachment clip 106 also extends perpendicularly frombody 102. Clip 106 includes a positioning arm 120 that also serves tohold blade 124 against body 102 at point 122. By applying pressure, clip106 can be swiveled outward in a direction 108 in order to insert blade124 into caliper extender 100. This swivel motion can be enabled eitherby the flexibility of the material, such as but not limited to plastic,which caliper extender 100 is constructed, or enabled by a joint 126between body 102 and clip 106. In the alternative, there may be a jointbetween arm 120 and the remainder of clip 106. When the pressure isremoved, clip 106 and arm 120 return to their original position, asshown in this figure.

It should be noted that blade 124 has a slight concave shape (if viewedfrom the top). This is a typical feature in many tape measure blades,provided so that lengths of blade 124 can be held horizontally withoutbending. This convex shape also facilitates the holding of tape 124against point 122 by cap 118 and arm 120, while allowing tape 124 toslide back and forth along caliper extender 100. Of course, the claimedsubject matter is equally applicable to a tape measure without a concaveor convex shape. In addition, body 102 may be concave to conform to theshape of blade 124.

FIG. 3 is a view of caliper extender 100 (FIGS. 1 and 2) from theperspective of FIG. 1 with tape blade 124 installed. In this example,caliper extender 100 does not have an extension such as extension 112(FIG. 1) attached. As explained above in conjunction with FIG. 2, blade124 is inserted into caliper extender 100 by applying pressure to clip106 in direction 108, placing blade 124 into extender 100 underneathclip 104 and releasing the pressure so that clip 106 returns to itsoriginal position.

Attached to blade 124 is a hook 128, which includes a section 130,extending from hook 128 at a ninety degree (90°) angle. Section 130conforms to blade 124, i.e. has a concave shape, so that section 130 canbe positioned against blade 124. Hook 128 is employed both to hold blade124 against an object to be measured and to prevent blade 124 from beingretracted into a casing 250 (see FIGS. 8–10).

In this example, hook 128 is attached to blade 124 by means of one ormore rivets 132 that extend through section 130 and blade 124. Blade 124also includes markings 134 (only a few of which are numbered) thatindicate the distance from hook 128 to their respective positions onblade 124. Typically, markings 134 are calibrated to either Metric orEnglish measurements.

Pointer 110 (FIGS. 1 and 2) provides a precise point on blade 124 fromwhich a measurement can be taken by noting the specific marking 134 towhich pointer 110 points. The value of the marking 134 corresponding tothe position of pointer 110 after a measurement is employed to determinea precise measurement. One method of determining a measurement is to adda fixed amount, corresponding to the distance between pointer 110 andend 116 of body 102, or the distance to the end of an extension (ifattached), to the value of marking 132 corresponding to the position ofpointer 110. Other possible methods of determining precise measurementsare discussed below in conjunction with FIGS. 5 and 6.

It should be noted that blade 124 is shown extending from hook 128,through caliper extender 100 and then bending upwards. The relevance ofthis particular position of blade 124 is explained in more detail belowin conjunction with FIG. 4.

FIG. 4 illustrates a method of employing caliper extender 100, describedabove in conjunction with FIGS. 1–3, to accurately take a measurement ofan inside dimension 142. Inside dimension 142 represents the distancebetween a wall 144 and a wall 146. In this example, extension 112(FIG. 1) is not attached to caliper 100.

To take an accurate measurement of inside dimension 142, caliperextender 100 is fastened onto blade 124 (FIG. 2), end 116 (FIGS. 1 and3) of caliper extender 100 is positioned against wall 144, and hook 126of blade 124 (FIG. 3) is extended to wall 146. The portion of tape blade124 that is extended towards end 116 through clips 104 and 106 is bentout of the way so that the user can easily position end 116 against wall144. Caliper extender's 100 position on blade 124 is then noted and usedto provide an accurate measurement of dimension 142 as illustrated belowin conjunction with FIG. 5.

FIG. 5 illustrates the position of caliper extender 100 (FIGS. 1–4) andblade 124 (FIGS. 2–4) after a measurement has been taken, as describedabove in conjunction with FIG. 4, i.e. blade 124 is positioned in thesame place with respect to caliper extender 100 as shown in FIG. 4. Anaccurate reading of inside dimension 142 (FIG. 4) is determined bynoting a marking 134 positioned at end 116 of blade 124. In thealternative, a measurement reading can be determined by noting theposition of pointer 110 (FIGS. 1–3) with respect to blade 124. Either apredetermined amount, corresponding to the distance from pointer 110 toend 116, can be added to a reading based upon the standard markings ofblade 124 or an alternative scale displayed on blade 124, such as themarkings described below in conjunction with FIG. 7, that takes thedistance between pointer 110 and end 116 into account. Of course, if anextension such as extension 112 (FIG. 1) is attached, the length of theextension must also be includes in any measurement.

FIG. 6 is an illustration of a caliper extender 160, which is analternative embodiment of the claimed subject matter. Like body 102(FIGS. 1–5) caliper extender 160 includes a body 162. Caliper extender160 also includes an extension 164, but rather than fitting into holeslike extension 112 (FIG. 1), extension 164 is configured to enablecaliper extender to be positioned into corners for measurements.

One with skill in the mechanical arts should understand how extensions112 and 164 can be attached to various caliper extensions such asextensions 100 and 160. Further, one with skill in the art shouldrecognize that there are many possible configurations of extensions,each designed to take a measurement in different circumstance.

To secure and guide a blade, such as, in this example, blade 124 (FIGS.3–5), caliper extender 160 has a single clip 106 designed to flex upwardso that a blade 124 can inserted into a channel 170 and positionedagainst body 162. An opening 168 provides a way for blade 124 to beslipped under clip 166. In other words, clip 166 is flexed upward andblade 124 is slipped through opening 168 into channel 170 underneathclip 166. Clip 166 then secures blade 124 in place.

Caliper extender 160 also includes a window 172 in clip 166 throughwhich a blade such as blade 124 or a blade 190 (see FIG. 7) is read. Apointer 174 within window 172 provides a precise point at which to readmarkings 134 (FIGS. 3 and 5).

FIG. 7 is a portion of a tape measure blade 190 employed in conjunctionwith caliper extender 160, illustrated above in FIG. 6. At one end of ablade body 192 is a hook 194 that functions like hook 122 (FIGS. 3–6). Aportion 196 of hook 194 extends at a ninety degree (90°) angle from therest of hook 194 and enables hook 194 to be attached to blade body 192by means of one or more rivets 198. Markings 202 and 204 indicate thedistance from hook 194 end of blade 190, with, in this example, marking202 positioned one (1) inch from hook 194 and marking 204 two (2) inchesfrom hook 194. Blade 190 also includes markings at one half (½) inch,such as marking 206, and one quarter (¼) inch, such as markings 208 and210, increments. For the sake of simplicity, all the markings on blade190 are not labeled. Typically, a tape measure may also includesmarkings (not shown) at one eighth (⅛) and one sixteenth ( 1/16) inchincrements. of course, blade 190 could also be marked in Metric ratherthan English units.

Marking 202 is associated with a label 212, or ‘1’, that indicates theactual distance in inches from marking 202 to hook 194. Marking 204 isassociated with a label 214, or ‘2’, that indicates the actual distancein inches from marking 204 to hook 194. A label 216 is associated with amarking (not shown) that is three (3) inches from hook 194.

A label 222, or ‘3’, also associated with marking 202, indicates thedistance from hook 194 to end 176 (FIG. 6) of caliper extender 160 whenmarking 202 is positioned under pointer 174 (FIG. 6). In a similarfashion, a label 224, or ‘4’, also associated with marking 204,indicates the distance from hook 194 to end 176 of caliper extender 160when marking 204 is positioned under pointer 174.

Also illustrated, by means of dotted lines, are a caliper extenderoutline 230, a tape viewing window outline 232 and a pointer outline234. Outline 230 represents the portion of blade 190 that would becovered by caliper extender 160 if it were installed on blade 190.Outline 232 represents the portion of blade 190 that would be visiblethrough tape viewing window 172 if caliper extender 160 were installedon blade 190. Outline 232 represents the portion of blade 190 that wouldbe obscured by pointer 174 if caliper extender 160 were installed onblade 190. It should be noted that labels 212, 214 and 216 would beobscured by caliper extender 160 and that label 222 and nearby one half(½) inch marking 206 and one quarter (¼) inch marking 210 would bevisible through tape viewing window 172. It should also be noted thatlabels 212, 214 and 216 are larger than labels 222 and 224 so that, whencaliper extender 160 is not in use, a user's eye is drawn to labels 212,214 and 216 rather than labels 222 and 224.

In the alternative, labels 222 and 224 can be printed in a lessprominent color than labels 212, 214 and 216. Also, tape viewing window172 may be constructed of a type of transparent material that renderslabels 222 and 224 more visible than when not viewed through window 172due to the transparent material's polarization or color filteringcharacteristics. Further, tape viewing window 172 may be shaped orotherwise constructed to magnify labels 222 and 224.

It should be noted that an embodiment of caliper extender 160 can beimplemented without tape viewing window 172. In this case, caliperextender 160 is used to determine inside measurements, like insidemeasurement 142 (FIG. 5), in a fashion similar to the proceduresdescribed above in conjunction with FIG. 5.

FIG. 8 is an illustration of a caliper extender 250, which is analternative embodiment of the claimed subject matter. Caliper extender250 includes a body 252 and an extension 254. Extension 254, unlikeextensions 112 (FIG. 1) and 164 (FIG. 6), is not designed to fit intoany particularly situation, but rather nearly serves to insure thatextender 250 is a uniform length regardless of which extension isattached. Caliper extender 250 includes a magnetic bar 256 that enablesextender 250 to be attached to a blade such as blades 124 (FIGS. 2–5)and 190 (FIG. 7).

FIG. 9 is an illustration of a caliper extender 270, which is analternative embodiment of the claimed subject matter. Caliper extender270 includes a body 272 and an extension 274. Extender 274 is notdesigned to fit into any particularly situation, but rather includesguidelines 282 indicating several possible configurations so that a useris able to customize extension 274 for the user's particular needs. Inother words, the user can cut, saw or break off portions of extension274 to perform a specific job. It should be noted that any of thedisclosed caliper extensions may be employed with any of the disclosedcaliper extension embodiments.

Caliper extender 270 includes a clip 276, a clip 278 and a pointer 280.Clips 276 and 278 serve the same purpose as clips 104 and 106 (FIGS. 1–3and 5) but are of a slightly different configuration.

FIG. 10 is an illustration of an alternative caliper extender 300, whichis incorporated into a retractable-type tape measure 400 (see FIG. 11).Caliper extender 300 includes a body 302, like body 102 of extender 100(FIGS. 1–5). Rather than clips 104 and 106 (FIGS. 1–3 and 5), a blade,such as a blade 190 (see FIG. 7), is held in place against body 302 by atape guide 304. Blade 190 slides through guide 304 in a channel 306.Guide 304 includes a tape viewing window 308, which enables blade 190 tobe viewed through guide 304. Within window 308 is a measuring pointer310 that points to a precise position on blade 190 for reading anaccurate measurement.

Guide 304 includes a lip 312 and a 314, which are employed to holdcaliper extender 170 into tape measure 200 when caliper extender 170 isnot in use. Lips 312 and 314 are explained in more detail below inconjunction with FIGS. 11 and 12. Finally, an end 316 of body 302,opposite guide 304 on body 302, is employed to make accuratemeasurements, in a fashion similar to that described above inconjunction with FIG. 5.

FIG. 11 is a side view of a tape measure 350 incorporating caliperextender 300 (FIG. 10). Tape measure 350 includes casing 352, typicallyconstructed of metal or plastic. Jutting from one end of casing 352 ishook 354, which is attached to blade (not shown). Hook 354 is similar tohooks 126 (FIGS. 3–5) and 194 (FIG. 7). Although not visible in thisfigure, a blade corresponding to hook 354 is wound into casing 352 suchthat the blade can be pulled form casing 352 take make a measurements.The blade of casing 352 is typically spring-loaded in casing 352 suchthat, if pulled and released, the blade of casing 352 automaticallyretracts into casing 252. Like mention above in conjunction with blade190 and hook 194 of FIG. 7, the hook of casing 352 both prevents theblade from being fully retracted into casing 352 and serves to hold theblade in position during some measurements by hooking around the edge ofthe object being measured. Casing 352, hook 354 and the associated bladeshould be familiar to anyone who has used a standard tape measure, whichis commonly available.

Caliper extender 300 (FIG. 10), which is not visible in this figure (seeFIG. 13), extends into casing 352 in a compartment 354, also not visiblehere but whose position within casing 352 is illustrated by dottedlines. Compartment 354 is described in more detail below in conjunctionwith FIGS. 12 and 13. A partial front view 358 of caliper extender 350is illustrated below in conjunction with FIG. 12.

FIG. 12 is an illustration of the partial front view 358 of tape measure350 in more detail. Hook 354 (FIG. 11) is shown extending fromcompartment 356 (FIG. 11).

FIG. 13 is an illustration of a close up of front view of tape measure350, without the corresponding blade installed so that caliper extender300 can be viewed. Caliper extender 300 is inserted into compartment356. Lip 312 rests upon a ledge 362 that is part of casing 352. Ledge362 prevents caliper extender 300 from falling out the bottom of tapemeasure 350 when caliper extender 300 is stored in casing 352. Of coursethere is another ledge (not shown) on the opposite side of casing 352from ledge 362 that supports lip 314 (FIG. 10).

FIG. 14 is an illustration of bottom view of tape measure 350, describedabove in conjunction FIGS. 11–13. In this view, the bottom of the bodyof 302 of caliper extender 300 is visible. Body 302 slides intocompartment 356 (FIGS. 11–13) and is held in place by ledges 364 and366, in addition to ledge 362 and the opposing ledge (not shown).

In casing 352, there are two nubs 368 and 370, which engage with twodimples 372 and 374, respectively, to prevent caliper extender 300 frominadvertently sliding out of compartment 356 when caliper extender 300is in a stored position. A slight pressure on caliper extender 300disengages nubs 368 and 370 from dimples 372 and 374 and allows extender300 to slide free of casing 352. Thus, caliper extender 300 can slidealong blade 190 (FIG. 7) enabling accurate measurements to be takenaccording to the procedure described in conjunction with FIG. 5.

The use of the terms “a” and “an” and “the” and similar referents in thecontext of describing embodiments of the invention (especially in thecontext of the following claims) are to be construed to cover both thesingular and the plural, unless otherwise indicated herein or clearlycontradicted by context. The terms “comprising,” “having,” “including,”and “containing” are to be construed as open-ended terms (i.e., meaning“including, but not limited to,”) unless otherwise noted. Recitation ofranges of values herein are merely intended to serve as a shorthandmethod of referring individually to each separate value falling withinthe range, unless otherwise indicated herein, and each separate value isincorporated into the specification as if it were individually recitedherein. All methods described herein can be performed in any suitableorder unless otherwise indicated herein or otherwise clearlycontradicted by context. The use of any and all examples, or exemplarylanguage (e.g., “such as”) provided herein, is intended merely to betterilluminate embodiments of the invention and does not pose a limitationon the scope of the invention unless otherwise claimed. No language inthe specification should be construed as indicating any non-claimedelement as essential to the practice of the invention.

Preferred embodiments of this invention are described herein, includingthe best mode known to the inventors for carrying out the invention.Variations of those preferred embodiments may become apparent to thoseof ordinary skill in the art upon reading the foregoing description. Theinventors expect skilled artisans to employ such variations asappropriate, and the inventors intend for the invention to be practicedotherwise than as specifically described herein.

1. A tape measure caliper extender, comprising: an extender body for usewith a tape blade, the extender body including an alignment clipsituated on a first side of the extender body by the first end of theextender body, and an attachment clip situated on a second side of theextender body opposite the alignment clip, wherein, when the attachmentclip is flexed and one edge of a tape measure blade is inserted underthe alignment clip, a second edge of the tape measure blade clears theattachment clip such that the extender body is removably attachable tothe tape blade, and wherein, when the attachment clip is unflexed afterinsertion, the alignment clip and the attachment clip hold the bladetightly enough to prevent the blade from moving vertically with respectto the body and loosely enough to allow the blade to move horizontallywith respect to the body in a direction parallel to the extender body;and wherein an accurate measurement of an object to be measured isascertained based upon the length of the extender body and a marking ofa first set of markings on a tape measure blade, at which a first end ofthe extender body is positioned when a second end of the extender bodyis positioned against a first side of the object to be measured and anend of the tape blade is positioned against a second side of the objectto be measured.
 2. The tape measure caliper extender of claim 1, furthercomprising a clip for removably attaching the tape blade.
 3. The tapemeasure caliper extender of claim 2, further comprising a window in theclip for viewing markings on the tape blade.
 4. The tape measure caliperextender of claim 1 further comprising a detachable extension positionedat the first end of the extender body wherein length of the object to bemeasured is ascertained based upon the length of the extender body inaddition to the marking and the length of the extender body.
 5. The tapemeasure caliper extender of claim 4, wherein the extension isconfigurable by a user.
 6. The tape measure caliper extender of claim 1,further comprising a pointer on the alignment clip for pointing to amarking on the tape measure blade corresponding to a length measurement;wherein the measurement is based upon the distance from the second endof the extender body to the pointer rather than the length of theextender body.
 7. The tape measure caliper extender of claim 6, whereinthe corresponding tape blade includes a second set of markings such thatthe measurement is read directly from the tape measure blade based upona marking of the second set of markings and the pointer.
 8. The tapemeasure caliper extender of claim 1, further comprising a pointer on theattachment clip for pointing to a marking on the tape measure bladecorresponding to a length measurement; wherein the measurement is basedupon the distance from the second end of the extender body to thepointer rather than the length of the extender body.
 9. The tape measurecaliper extender of claim 8, wherein the corresponding tape bladeincludes a set of markings such that the measurement is read directlyfrom the tape measure blade based upon the second set of markings andthe pointer.
 10. The tape measure caliper extender of claim 1, whereinthe object to be measured is an inside dimension.